From: Muranyi, Arpad ([email protected])
Date: Thu Jan 06 2000 - 12:46:53 PST
Along those lines I would add that a nominal X-Ohm trace can
have +/- several Ohms of variation due to even and odd mode
signaling. So a "50 Ohm" trace can easily show 48-52 Ohms of
impedance in such situations. So much for all the fuss about
matching the impedance of the driver and/or termination to the
line impedance precisely...
Arpad Muranyi
Intel Corporation
===================================================================
-----Original Message-----
From: Haller, Robert [mailto:[email protected]]
Sent: Thursday, January 06, 2000 11:35 AM
To: '[email protected]'
Subject: RE: [SI-LIST] : What's your favourite Screwy SI Concept?
Ok, I'll bite too.
Reporting the impedance of a PCB trace at 50.123 Ohms when measurement
accuracy is +/- .5 ohms at best.
Using a 40 ps TDR edge to measure propagation delay for a considerably
slower application.
Bob Haller
Compaq Computer Corporation
>Subject: [SI-LIST] : What's your favourite Screwy SI Concept?
>Cheers,
>Andrew Phillips
>Supercomputing Systems AG
>Zurich, Switzerland
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